[dpdk-dev] [PATCH] bus/vmbus: use SMP memory barrier for signaling read

[Long Li]

From: Long Li <longli at microsoft.com>

rte_smp_mb() uses the same locked ADD as the in-kernel vmbus driver,
and it has slightly performance improvement over rte_mb().

Signed-off-by: Long Li <longli at microsoft.com>
---
 drivers/bus/vmbus/vmbus_channel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bus/vmbus/vmbus_channel.c b/drivers/bus/vmbus/vmbus_channel.c
index aaa801d88..c60470332 100644
--- a/drivers/bus/vmbus/vmbus_channel.c
+++ b/drivers/bus/vmbus/vmbus_channel.c
@@ -214,7 +214,7 @@ void rte_vmbus_chan_signal_read(struct vmbus_channel *chan, uint32_t bytes_read)
 		return;
 
 	/* Make sure reading of pending happens after new read index */
-	rte_mb();
+	rte_smp_mb();
 
 	pending_sz = rbr->vbr->pending_send;
 	if (!pending_sz)
-- 
2.25.1